If this only happens to one receiver then i would say it's a problem on the other end. You did not indicate the other end, cell or pc or what type of serivce, Company email, internet email or something else. best guess is the receiving service is somehow reading the email wrong.
There is a common problem with the body of the email missing but not your issue.

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I'm choosing the first one to set up my emails and my signature. I'm asked to provide user namer and password and here is the shit:
1. I'm writing my email - for exampler and my password. The reply is - your user name must be at lease 4 characters ( it is alwys more than 4).
or

2. I'm writing my BB id and password. The reply is that my password or user name is invalid.

Why this thing is hapening? It is really strange and I can not find any help on this at BB site.

I'm choosing the first one to set up my emails and my signature. I'm asked to provide user namer and password and here is the shit:
1. I'm writing my email - for exampler and my password. The reply is - your user name must be at lease 4 characters ( it is alwys more than 4).
or

2. I'm writing my BB id and password. The reply is that my password or user name is invalid.

Why this thing is hapening? It is really strange and I can not find any help on this at BB site.

Thanl you in advance!

You can and should post a new thread instead of hijacking an existing one, particularly with unrelated questions.